Sound-transmitting device.



Patented Mar. 11,1919.

W w. E

EDGAB. CHERRY, OF OAKLAND, CALIFORNIA.

SOUND-TRANSMITTING DEViCE.

Specification of Letters Patent.

Patented Main lit, this Application filed July 29, 1918. Serial No. 247,202.

To all whom it may concern:

Be it known that 1, Emma Gummy, a citizen of the .l nited States. and a resident of Oakland, in the county of Alameda and State of California. have invented a new and ln'iproved Souiul lransniitting Device, of which the following is a full, clear, and exact description.

This invention relates to a sound transmitting device of that kind adapted to be carried by a partially dcat' person for enabling sounds to be heard.

The invention has for its general objects to improve the construction of devices of this character so as to be extremely sensitive to sounds and also adjustable as to sensitiveness to suit the requirements of the user, this being brought about by having a dia phragm chamber ot' adjustable sirte.

Another object of the invention is the provision of an improved term oi earpiece or receiver whereby the sounds can be betler heard.

A still further object of the invention is the provision oi a novel connection between the flexible tube and the transmitter.

\Vith such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which willbe set forth with particularity in the following description and claim appended hereto.

In the accompanyingdrawing, which illus trates one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a perspective view of the sound transmitting device;

Fig. 2 is a front view of the transmitter with the adjustable cap'and. diaphragm re moved;

:F 3 is a diamctrical section of the transmitter; and

Fig. 4 is a. diainetrical section of the earpiece or receiver.

Referring to the drawing, A. designates the transmitter, B the flexible sound-conducting tube, and (l the earpiece or receiver.

The transmitter A comprises a body 1 in the form of a circular piece provided with a chamber 2 and having a threaded ofpening 3 in its back. The circumference o the annular body 1 is formed with a screwthread 4 and a peripheral flange-5. Engaging the thread l is a cap e provided with a large opening 7 or equivalent means for admitting sound vibrations tothe interior of the transmitter so as to act on the diaphragm ta; which is fastened at one point near its periphery to a bearing block 9 ar tillgGfl in the body 1, the periphery of the diaphragm being free at all points except where it is attached to its support. The front chamber or space 10 to the open side of the diaph 'agin is adjustable in size .by screwing the cap 6 further on or oil the body 1. The cap 6 is adapted to be held in adjusted position by a set-screw 11. In turning the cap the flange .3 is engaged by one end and the cap 6 by the other, and then by relative turning movement the 'ap is screwed back or forth.

An attaching coupling 12 has a nipple 13 to which is applied the tube B. The coupling 1:2 has a peripheral flange 14 which is adapted to grip when screwing the coupling in or out. The coupling has a bore 15 which llares on a wide angle toward the diaphragm so that be sound waves from the diaphragm will be concentrated and con-- ducted into the tube ll.

lhe receiver or earpiece (j is tcrably, although not necessai'ily a tiexi .fhollow hemispherical member it attached to the tube B, the latter having an extremity 17 extending into the member 16. '7 treinity 17 is flexible and is adapted to be placed at the end of the ear passage, and in the edge are notche. 18, which provide for air circulation and a better passagc of sounds. The extremity 1. terminates short of the edge of the trnmpetdike member 16 so that the edge 19 .ot' the latter can bear against the outer car while the tubular member 17 is in proper relation to the sound passage of the car.

A sound transmitting device. of the character shown possesses greatsensitiveness and. a wide range of iuljustinent as to sensitiveness. it is comparatively simple and inexpensive to manufacture, and the flexible or soft rubber receiver or; hles a better application of the device to the ear and allows the device as a. whole to be packed. into comparatively small space when not in use.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the l his era invention apperteiee and. While I have 61% scribed file principle e13 operation, together with file device which I co lder be be the best entibodiment thereof; .L desire to have it unglersizood that the device shown. is merely illustrative en that such ehanqee be rnwfie when desired. as fell within the scope of the appended claim:

Having thus zl esorioed my inventiem claim as new zmd desire to secure 1);? Leno Patent A soundi trensn'xiizti. device of the ohm-em tel described, oompnemg body 131 threaded opening in its back and a periphery, the front of the bodv having elm; be): fomled i2: two diameters, e phmgm secure i at one poini: io-

body to within the portion of the chamber having the iaz'g'er diumeber, an apertures cap sozewing en the body, an externally threedetz coupling member screwing into the th. dezi eye/11mg of we body, said. member hm e. end. is flared and pro here who N 4 4 .4 vz L he. a mppbe on We owe). 1W, e hem 1e one hevmg one-"mi Secured; on the Yuppie, and e hemzspne' ear 1 .ece secured to the other "5 5" '3 4" 4 .I end 0: the tube Wi U119 end 01 bhfi wee eete moo the some 

